From agent99@sgi.com Fri Nov 30 23:47:35 2001
From: SGI Security Coordinator
To: agent99@sgi.com
Date: Fri, 30 Nov 2001 13:07:05 -0800
Subject: IRIX CDE vulnerabilities
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______________________________________________________________________________
SGI Security Advisory
Title: CDE vulnerabilities
Number: 20011107-01-P
Reference: CERT CA-2001-31
Date: November 30, 2001
______________________________________________________________________________
- -----------------------
- --- Issue Specifics ---
- -----------------------
Security Focus has reported that several suid root CDE utilities have buffer
overruns which can lead to security compromises. These utilities are
"dtaction", "dtprintinfo", "dtterm", "dtsession", and "dtspcd".
There is a related issue with the CDE ToolTalk "ttsession" messaging
server's usage of a weak RPC authentication mechanism. Because of this, the
ttsession process can be manipulated to execute unauthorized arbitrary
programs with the privileges of the running ttsession.
SGI has investigated the issues and recommends the following steps for
neutralizing the exposure. It is HIGHLY RECOMMENDED that these measures be
implemented on ALL vulnerable SGI systems. These issues have been corrected
in future releases of CDE.
- --------------
- --- Impact ---
- --------------
CDE is an optional product and is not installed by default.
The dtspcd and ttsession vulnerabilities can be exploited by a remote user.
The other vulnerabilities would require a local user account on the host
system in order to exploit them.
The exploitation of these vulnerabilities can lead to a root compromise.
These vulnerabilities have been reported by Security Focus, CERT, BugTraq,
Last Stage of Delirium Research Group, and ISS, and have been publicly
discussed in Usenet newsgroups and security mailing lists.
CERTŪ Advisory CA-2001-31 Buffer Overflow in CDE Subprocess Control Service:
http://www.cert.org/advisories/CA-2001-31.html
- ----------------------------
- --- Temporary Workaround ---
- ----------------------------
SGI acknowledges that it may not always be possible to immediately install
patches or upgrade the operating system. In those cases, we recommend
removing the suid bit from the relevant binaries until the patch can be
applied. This will result in reduced functionality of the system, and will
not completely secure the system from these vulnerabilities.
If you want to do this, please follow this procedure:
% su - root
# cd /usr/dt/bin
# chmod 755 dtaction
# chmod 755 dtprintinfo
# chmod 755 dtsession
# chmod 755 dtterm
# chmod 755 rpc.ttdbserverd
# exit
It is not necessary to reboot the system after doing this. You should
install the patch or upgrade to a later version of CDE as soon as it is
possible to do so.
- ----------------
- --- Solution ---
- ----------------
SGI has provided a patch for CDE 5.1 which can be applied to an IRIX
6.5.x system with CDE installed. The problem will be fixed in a future
release of CDE.
CDE Version Vulnerable? Patch # Other Actions
----------- ----------- ------- -------------
CDE 5.0 unknown Note 1
CDE 5.1 yes 4416 Note 2
NOTES
1) This version of CDE has been retired. For more information, see
Software Product Knowledge Database http://support.sgi.com/spk/
2) This patch can be installed on IRIX 6.5-6.5.14 with CDE 5.1
installed.
##### Patch File Checksums ####
The actual patch will be a tar file containing the following files:
Filename: README.patch.4416
Algorithm #1 (sum -r): 36835 8 README.patch.4416
Algorithm #2 (sum): 53529 8 README.patch.4416
MD5 checksum: 5CB39FFFABF73E391A462E64DB4A63DD
Filename: patchSG0004416
Algorithm #1 (sum -r): 39697 3 patchSG0004416
Algorithm #2 (sum): 14998 3 patchSG0004416
MD5 checksum: C1BB56CB64AFD836F002DB1DADA594D0
Filename: patchSG0004416.cde_sw
Algorithm #1 (sum -r): 33090 4336 patchSG0004416.cde_sw
Algorithm #2 (sum): 43662 4336 patchSG0004416.cde_sw
MD5 checksum: 4A2D8F97737823CAB1B6F581B9BA1722
Filename: patchSG0004416.idb
Algorithm #1 (sum -r): 58676 4 patchSG0004416.idb
Algorithm #2 (sum): 15813 4 patchSG0004416.idb
MD5 checksum: 8F2B1C356965B35AD874E055C221032B
- -------------------
- --- Information ---
- -------------------
SGI Security Advisories can be found at:
http://www.sgi.com/support/security/ and
ftp://patches.sgi.com/support/free/security/advisories/
SGI Security Patches can be found at:
http://www.sgi.com/support/security/ and
ftp://patches.sgi.com/support/free/security/patches/
SGI patches for IRIX can be found at the following patch servers:
http://support.sgi.com/irix/ and ftp://patches.sgi.com/
SGI freeware updates for IRIX can be found at:
http://freeware.sgi.com/
SGI fixes for SGI open sourced code can be found on:
http://oss.sgi.com/projects/
SGI patches and RPMs for Linux can be found at:
http://support.sgi.com/linux/ or
http://oss.sgi.com/projects/sgilinux-combined/download/security-fixes/
SGI patches for Windows NT or 2000 can be found at:
http://support.sgi.com/nt/
IRIX 5.2-6.4 Recommended/Required Patch Sets can be found at:
http://support.sgi.com/irix/ and ftp://patches.sgi.com/support/patchset/
IRIX 6.5 Maintenance Release Streams can be found at:
http://support.sgi.com/colls/patches/tools/relstream/index.html
IRIX 6.5 Software Update CDs can be obtained from:
http://support.sgi.com/irix/swupdates/
The primary SGI anonymous FTP site for security advisories and patches is
patches.sgi.com (216.32.174.211). Security advisories and patches are
located under the URL ftp://patches.sgi.com/support/free/security/
For security and patch management reasons, ftp.sgi.com (mirrors
patches.sgi.com security FTP repository) lags behind and does not do a
real-time update.
- ------------------------
- --- Acknowledgments ----
- ------------------------
SGI wishes to thank Security Focus, CERT, BugTraq, Last Stages of Delirium
Research Group, ISS and the users of the Internet Community at large for
their assistance in this matter.
- -----------------------------------------
- --- SGI Security Information/Contacts ---
- -----------------------------------------
If there are questions about this document, email can be sent to
security-info@sgi.com.
------oOo------
SGI provides security information and patches for use by the entire SGI
community. This information is freely available to any person needing the
information and is available via anonymous FTP and the Web.
The primary SGI anonymous FTP site for security advisories and patches is
patches.sgi.com (216.32.174.211). Security advisories and patches are
located under the URL ftp://patches.sgi.com/support/free/security/
The SGI Security Headquarters Web page is accessible at the URL:
http://www.sgi.com/support/security/
For issues with the patches on the FTP sites, email can be sent to
security-info@sgi.com.
For assistance obtaining or working with security patches, please
contact your SGI support provider.
------oOo------
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------oOo------
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------oOo------
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______________________________________________________________________________
This information is provided freely to all interested parties
and may be redistributed provided that it is not altered in any
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